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I'm new in C#. In c# I can't set value of a structure to null how can I create a structure with null value support?
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However, since structs are value types that cannot be null , the default value of a struct is the value produced by setting all value type fields to their default value and all reference type fields to null .
You cannot ask your struct type to set that pointer to null by itself. You will have to do it explicitly every time you create an object of type struct stack , e.g. struct stack my_stack = { 0 };
A Null value means that the value of a field, variable or parameter is undefined. Variables and parameters are implicitly initialized to Null when they are declared. For String or Struct data types, Uniface provides some special handling.
Struct fields, like columns of primitive types, can have null values.
Structs and value types can be made nullable by using the Generic Nullable<> class to wrap it. For instance:
Nullable<int> num1 = null;
C# provides a language feature for this by adding a question mark after the type:
int? num1 = null;
Same should work for any value type including structs.
MSDN Explanation: Nullable Types (c#)
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You can use Nullable<T> which has an alias in C#. Keep in mind that the struct itself is not really null (The compiler treats the null differently behind the scenes). It is more of an Option type.
Struct? value = null;
As @CodeInChaos mentions Nullable<T> is only boxed when it is in a non-null state.
Nullable Types
Boxing Nullable Types
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